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What is the degree of (x^8(x^2+1)-x^2(x^8-7))?

Answer and explanation

Correct answer: 8

On expanding, \(x^8(x^2+1)-x^2(x^8-7)=x^{10}+x^8-x^{10}+7x^2=x^8+7x^2\). The \(x^{10}\) terms cancel each other. The highest power of \(x\) in the remaining polynomial is \(8\), so its degree is \(8\). Option \(10\) would result from overlooking the cancellation of like terms. Exam tip: Always simplify a polynomial before finding its degree.

Related tags

PolynomialsDegree Of PolynomialExpansionLike TermsCancellationAlgebraDegree Of A PolynomialIntroduction To Polynomials

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